I drive a county school bus. As part of my mid-day route, I pick up a couple of students from the local military base. One day last week, I presented my CDL and school staff ID cards through the bus window to the young male security guard at the gate as usual. As he handed them back to me, he said the following: "Boom." "Boom?" I thought as I drove off. Odd thing to hear from a guy, part of whose job is to look for illicit explosives on the vehicles he admits onto the base. Then I thought, hmm, is this a new slang word, along the lines of "cool" or "groovy" (I remember when "groovy" was new!)? More research was indicated. So today I was looking for an opportunity to try out this word. About 3:40 pm, we arrived at the school to pick up the afternoon run. One of the teachers got on the bus, to get the kids situated for the ride home. They are "special needs" boys, and they often need help settling down in their seats. We had less than a full load, as a couple of them had been picked up early by parents. So once they were all on, she turned to me and said "that's it". I seized my opportunity, and blurted out "Boom!" And she immediately gave me a smile and a "Boom" in return! I took this to mean that I'd used it correctly, since she is much younger than me, and she works closely with kids all day. All I do is drive them around for a few minutes each day. I don't really interact/converse with them. It's hard for us 57-year-old guys to keep up with the bleeding edge of hipness. So I'm presenting this to the assembled wisdom of TB. Is "boom" the new "cool" or "groovy"?